稳温平台石墨炉内元素的原子化效率

Atomization Efficiency of Some Elements in a Stabilized Temperature Platform Furnace

导出在稳温平台石墨炉内原子化效率的表示式．测定了日立GA－3平台石墨炉内Ag，Cd，Cr，Ga，Ge和In等元素的原子化效率值（βp，βicxp和βical）．实质上，原子化效率是等于条件吸收系数与吸收系数之比．由于被热管壁吸附的分析物再蒸发和扩散作用，导致原子停留时间延长．因此，在相同的测量条件下元素的βicxp＜βical．

The expressions were derived to describe the atomization efficiency in a stabilized tempera-ture platform furnace (STPF). The atomization efflciency of an Hitachi GA-3 wlth the platforrn for the production and containment of atomic vapour was determined for Ag, Cd, Cr, Ga, Ge and In by omeans of a method proposed under isothermal conditions. Atomization efficiency is, in substance,equal to the ratio of condition absorption coefficient to calculated absorption coefficient. Part of the atomic vapour of analyte is readsorbed by the heated tube wall at high temperatures and reevaporation of the adsorbed analyte followed by diffuslon account for the longer atomlc residence time, and itappears that the βicxp value of elements is always smaller than that of βical under the same measurement conditions.